Scaling study of the pion electroproduction cross sections and the pion form factor - INSPIRE

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Scaling study of the pion electroproduction cross sections and the pion form factor

T. Horn
(
- Jefferson Lab
)
,
X. Qian
(
- TUNL, Durham
)
,
J. Arrington
(
- Argonne, PHY
)
,
R. Asaturyan
(
- Yerevan Phys. Inst.
)
,
F. Benmokthar
(
- Maryland U.
)

Jul, 2007

6 pages

Published in:

Phys.Rev.C 78 (2008) 058201

e-Print:

0707.1794 [nucl-ex]

DOI:

10.1103/PhysRevC.78.058201

Report number:

JLAB-PHY-07-679

View in:

reference search102 citations

Citations per year

Abstract: (arXiv)

The

^{1}

H(

e,e^\prime \pi^+

)n cross section was measured for a range of four-momentum transfer up to

Q^2

=3.91 GeV

^2

at values of the invariant mass,

W

, above the resonance region. The

Q^2

-dependence of the longitudinal component is consistent with the

Q^2

-scaling prediction for hard exclusive processes. This suggests that perturbative QCD concepts are applicable at rather low values of

Q^2

. Pion form factor results, while consistent with the

Q^2

-scaling prediction, are inconsistent in magnitude with perturbative QCD calculations. The extraction of Generalized Parton Distributions from hard exclusive processes assumes the dominance of the longitudinal term. However, transverse contributions to the cross section are still significant at

Q^2

=3.91 GeV

^2

.

electron p: exclusive reaction
pi+: electroproduction
differential cross section: momentum transfer dependence
scaling
quantum chromodynamics: perturbation theory
cross section: factorization
pi: form factor
cross section: longitudinal
cross section: transverse
field theory: conformal

References(42)

Figures(0)

[1]

Factorization for hard exclusive electroproduction of mesons in QCD

John C. Collins
(
- Penn State U. and
- CERN
)
,
Leonid Frankfurt
(
- Tel Aviv U.
)
,
Mark Strikman
(
- Penn State U.
)

- Phys.Rev.D 56 (1997) 2982-3006
•
e-Print:
- hep-ph/9611433
•
DOI:
- 10.1103/PhysRevD.56.2982

[2]

Hard exclusive pseudoscalar meson electroproduction and spin structure of a nucleon

L.L. Frankfurt
(
- Tel Aviv U. and
- St. Petersburg, INP
)
,
P.V. Pobylitsa
(
- St. Petersburg, INP and
- Ruhr U., Bochum
)
,
Maxim V. Polyakov
(
- St. Petersburg, INP and
- Ruhr U., Bochum
)
,
M. Strikman
(
- St. Petersburg, INP and
- Penn State U. and
- DESY
)

- Phys.Rev.D 60 (1999) 014010
•
e-Print:
- hep-ph/9901429
•
DOI:
- 10.1103/PhysRevD.60.014010

Scaling Laws at Large Transverse Momentum

Stanley J. Brodsky
(
- SLAC
)
,
Glennys R. Farrar
(
- Caltech
)

- Phys.Rev.Lett. 31 (1973) 1153-1156
•
DOI:
- 10.1103/PhysRevLett.31.1153

[3]

Exclusive rho0 meson electroproduction from hydrogen at CLAS

CLAS

Collaboration

•

C. Hadjidakis
(
- Orsay, IPN and
- Frascati
)

et al.

- Phys.Lett.B 605 (2005) 256-264
•
e-Print:
- hep-ex/0408005
•
DOI:
- 10.1016/j.physletb.2004.11.019

[4]

Deeply virtual and exclusive electroproduction of omega mesons

CLAS

Collaboration

•

L. Morand
(
- Saclay
)

et al.

- Eur.Phys.J.A 24 (2005) 445-458
•
e-Print:
- hep-ex/0504057
•
DOI:
- 10.1140/epja/i2005-10032-4

[5]

Probing generalized parton distributions in pi N ---> l+ l- N

Edgar R. Berger
(
- Ecole Polytechnique
)
,
M. Diehl
(
- DESY
)
,
B. Pire
(
- Ecole Polytechnique
)

- Phys.Lett.B 523 (2001) 265-272
•
e-Print:
- hep-ph/0110080
•
DOI:
- 10.1016/S0370-2693(01)01345-4

[6]

Regge description of charged pseudoscalar meson electroproduction above the resonance region

M. Vanderhaeghen
(
- Saclay and
- DAPNIA, Saclay
)
,
M. Guidal
(
- Saclay and
- DAPNIA, Saclay
)
,
J.M. Laget
(
- Saclay and
- DAPNIA, Saclay
)

- Phys.Rev.C 57 (1998) 1454-1457
•
DOI:
- 10.1103/PhysRevC.57.1454

[6]

Pion and kaon photoproduction at high-energies: Forward and intermediate angles

M. Guidal
(
- DAPNIA, Saclay and
- NIKHEF, Amsterdam
)
,
J.M. Laget
(
- DAPNIA, Saclay
)
,
M. Vanderhaeghen
(
- DAPNIA, Saclay
)

- Nucl.Phys.A 627 (1997) 645-678
•
DOI:
- 10.1016/S0375-9474(97)00612-X

[7]

The aerogel threshold Cerenkov detector for the high momentum spectrometer in Hall C at Jefferson Lab

R. Asaturyan
(
- Yerevan Phys. Inst.
)
,
R. Ent
(
- Jefferson Lab
)
,
Howard C. Fenker
(
- Jefferson Lab
)
,
D. Gaskell
(
- Jefferson Lab
)
,
G.M. Huber
(
- Regina U.
)

et al.

- Nucl.Instrum.Meth.A 548 (2005) 364-374
•
e-Print:
- physics/0411147
•
DOI:
- 10.1016/j.nima.2005.04.058

[8]

Ph.D.thesis,Massachussets Institute of Technology (2006)

B.Clasie

[9]

Separation of Sigma-L and Sigma-u in pi+ Electroproduction Above the Resonance Region

P. Brauel
(
- DESY and
- Hamburg U.
)
,
T. Canzler
(
- DESY and
- Hamburg U.
)
,
D. Cords
(
- DESY and
- Hamburg U.
)
,
R. Felst
(
- DESY and
- Hamburg U.
)
,
Guenter Grindhammer
(
- DESY and
- Hamburg U.
)

et al.

- Phys.Lett.B 69 (1977) 253-256
•
DOI:
- 10.1016/0370-2693(77)90656-6

[9]

Electroproduction of $\pi^+ n$ , $\pi^- p$ and $K^+ \Lambda$ , $K^+ \Sigma^0$ Final States Above the Resonance Region

P. Brauel
(
- DESY and
- Hamburg U.
)
,
T. Canzler
(
- DESY and
- Hamburg U.
)
,
D. Cords
(
- DESY and
- Hamburg U.
)
,
R. Felst
(
- DESY and
- Hamburg U.
)
,
Guenter Grindhammer
(
- DESY and
- Hamburg U.
)

et al.

- Z.Phys.C 3 (1979) 101
•
DOI:
- 10.1007/BF01443698

[10]

Measurement of the Pion Form-factor in the Timelike Region for $q^2$ Values Between .1-{GeV}/ $c^2$ and .18-{GeV}/ $c^2$

S.R. Amendolia
(
- INFN, Milan and
- Pisa, Scuola Normale Superiore
)
,
B. Badelek
(
- INFN, Milan and
- Pisa, Scuola Normale Superiore
)
,
G. Batignani
(
- INFN, Trieste and
- SISSA, Trieste
)
,
G.A. Beck
(
- Turin U. and
- Turin, Cosmo-Geofisica Lab
)
,
E.H. Bellamy
(
- Imperial Coll., London
)

et al.

- Phys.Lett.B 138 (1984) 454-458
•
DOI:
- 10.1016/0370-2693(84)91938-5

[10]

A Measurement of the Space - Like Pion Electromagnetic Form-Factor

NA7

Collaboration

•

S.R. Amendolia
(
- INFN, Milan and
- Pisa, Scuola Normale Superiore
)

et al.

- Nucl.Phys.B 277 (1986) 168
•
DOI:
- 10.1016/0550-3213(86)90437-2

[11]

Determination of the Longitudinal and the Transverse Part in pi+ Electroproduction

et al.

- Nucl.Phys.B 137 (1978) 294-300
•
DOI:
- 10.1016/0550-3213(78)90523-0

[12]

Determination of the pion charge form-factor for Q2 = 0.60-GeV2 - 1.60-GeV**2

Jefferson Lab F(pi)

Collaboration

•

V. Tadevosyan
(
- Yerevan Phys. Inst.
)

et al.

- Phys.Rev.C 75 (2007) 055205
•
e-Print:
- nucl-ex/0607007
•
DOI:
- 10.1103/PhysRevC.75.055205

[13]

Determination of the Charged Pion Form Factor at Q2 = 1.60 and 2.45-(GeV/c)2

Jefferson Lab F(pi)-2

Collaboration

•

T. Horn
(
- Maryland U.
)

et al.

- Phys.Rev.Lett. 97 (2006) 192001
•
e-Print:
- nucl-ex/0607005
•
DOI:
- 10.1103/PhysRevLett.97.192001

Charged pion form factor between $Q^2$ =0.60 and 2.45 GeV $^2$ . I. Measurements of the cross section for the ${^1}$ H( $e,e'\pi^+$ ) $n$ reaction

Jefferson Lab

Collaboration

•

H.P. Blok
(
- NIKHEF, Amsterdam and
- Vrije U., Amsterdam
)

et al.

- Phys.Rev.C 78 (2008) 045202
•
e-Print:
- 0809.3161
•
DOI:
- 10.1103/PhysRevC.78.045202

Rho Production by Virtual Photons

et al.

- Nucl.Phys.B 113 (1976) 53-92
•
DOI:
- 10.1016/0550-3213(76)90455-7

Exclusive leptoproduction of rho0 mesons from hydrogen at intermediate virtual photon energies

HERMES

Collaboration

•

A. Airapetian

et al.

- Eur.Phys.J.C 17 (2000) 389-398
•
e-Print:
- hep-ex/0004023
•
DOI:
- 10.1007/s100520000483

Exclusive $\rho^0$ , $\omega$ and $\phi$ Electroproduction

et al.

- Phys.Rev.D 24 (1981) 2787
•
DOI:
- 10.1103/PhysRevD.24.2787

Diffractive production of $\rho^0(770)$ mesons in muon proton interactions at 470-GeV

E665

Collaboration

•

M.R. Adams
(
- Illinois U., Chicago
)

et al.

- Z.Phys.C 74 (1997) 237-261
•
DOI:
- 10.1007/s002880050386

[14]

Exclusive Processes in Quantum Chromodynamics: Evolution Equations for Hadronic Wave Functions and the Form-Factors of Mesons

G.Peter Lepage
(
- Cornell U., LNS
)
,
Stanley J. Brodsky
(
- SLAC
)

- Phys.Lett.B 87 (1979) 359-365
•
DOI:
- 10.1016/0370-2693(79)90554-9

[15]

Lecture Notes and Supplements in Physics

R.K. Bhaduri

[16]

Pion form-factor in QCD: From nonlocal condensates to NLO analytic perturbation theory

A.P. Bakulev
(
- Dubna, JINR
)
,
K. Passek-Kumericki
(
- Boskovic Inst., Zagreb
)
,
W. Schroers
(
- MIT, LNS
)
,
N.G. Stefanis
(
- Ruhr U., Bochum
)

- Phys.Rev.D 70 (2004) 033014,
- Phys.Rev.D 70 (2004) 079906 (erratum)
•
e-Print:
- hep-ph/0405062
•
DOI:
- 10.1103/PhysRevD.70.033014

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